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In my '74 240d, I (I = experienced MB diesel guy) just replaced the guts of my AC system. Brand new ACcompressor, AC clutch, AC expansion valve, AC drier/accummulator, and new refringerant.

Once all the above parts were replace, mechanic tried to turn on the AC inside the car, but AC wouldn't start. The green light didn't go on.

Any idea what could be wrong, or what would be the recommended way to diagnose this issue?
 

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1973 220D, 1988 300SEL, 1991 300TE
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332 Posts
Vacuum leak? As I recall the switch operates the vacuum doors under the dash the one on the drivers side also pushes a switch which is how the green light turns on. Maybe that or a fuse but without the light the compressor will not engage.

Was the motor running when you tried? You might not have a serious leak just no vacuum left after sitting for a while.

Good luck, lots of hot days coming


Frank Flynn. Poet, Artist & Mystic
 
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